### time dilation

(relativity's ability to make time differ for different objects)

**Time dilation** is the effect that for some
objects, more time as passed than for others,
depending their position and velocity.
It is a consequence of relativity.

**Special relativity** implies time dilation based
upon the relative motion of two objects.
General relativity also produces time dilation depending
upon how curved space is,
which is an aspect of gravity,
in which case it is called **gravitational time dilation**.

Cosmological time dilation is the apparent
time dilation of events viewed from
large (high redshift) distances.

Time dilation challenges intuition based
upon daily experience, but is not only proven,
but some technology that depends upon high-precision
time measurement, such as **GPS**,
requires time dilation to be taken into account
in order to function.

(*physics,relativity*)
http://en.wikipedia.org/wiki/Time_dilation

**Referenced by:**

cosmological time dilation

radial velocity (RV)

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